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Archived

Avalanche Forecast

Dec 25th, 2019–Dec 26th, 2019
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

A weak surface hoar layer can be triggered by skiers and riders in areas where the storm snow has formed a slab. When uncertainty is present, choose conservative terrain.

Weather Forecast

A high pressure system brings stable weather conditions today with mostly sun with the occasional cloud. No precipitation is expected as alpine temperatures reach a high of -10 C and freezing levels stay below valley bottom. Winds will be light from the NW. High pressure is expected to last through to the end of the week.

Snowpack Summary

The top 50cm is forming into soft slabs especially near ridge crests. A new surface crust exists on steep solar aspects. The Dec 11th SH (5-12mm) is well preserved and is now down 90-120cm. The Nov 23 SH/Cr is down 160-185cm. Early season crusts still persist in the lower snowpack.

Avalanche Summary

No new avalanches were observed yesterday.

Confidence

Due to the number of field observations

Avalanche Problems

Persistent Slabs

Last weekend's storm saw huge avalanches running on the December 11th surface hoar. As the storm snow morphs into slabs, this layer gets re-primed. A 100cm slab atop well-preserved large surface hoar is a recipe for HUMAN TRIGGERED avalanches.

  • Be wary of slopes that did not previously avalanche.
  • Use conservative route selection, stick to supported terrain features, avoid overhead hazards.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 2 - 3.5